Algebra: Solving Equations and Inequalities

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Questions and Answers

What is the value of x in the equation $-(1 - x) = -2(3x - 1)$?

  • 1/7
  • 3/5
  • 3/7 (correct)
  • 1/5

If $-5x + 7 = 2x - 3$, what is the value of x?

  • 4/3
  • 4/7
  • 10/3
  • 10/7 (correct)

What is the solution for n in the inequality $-17 + 3n ≤ 7(n - 2)$?

  • n ≤ 15/4 (correct)
  • n ≥ 15/4
  • n ≥ 3/4
  • n ≤ -3/4

Which point is on the graph of $2x - 16y = 8$?

<p>(0, 2) (A)</p> Signup and view all the answers

Solving the area formula $A = 1/2 (b₁ + b₂)h$ for $b₁$ results in which equation?

<p>b₁ = 2A/h - b₂ (B)</p> Signup and view all the answers

From the profit equation $P = 2n - 800$, express n as a function of P.

<p>n = 1/2 (P + 800) (D)</p> Signup and view all the answers

Which inequality could be used to determine b, the number of blouses, and p, the number of pants that Grace can afford?

<p>17b + 25p ≤ 75 (B)</p> Signup and view all the answers

In the given right triangle, which system of equations could be used to solve for x and y if y is 15 less than twice x?

<p>x + y = 90; 2x - y = 15 (A)</p> Signup and view all the answers

What is the maximum number of hamburgers Harry can buy if he buys 20 hot dogs?

<p>38 hamburgers (B)</p> Signup and view all the answers

Which of the following represents a function based on the given set of ordered pairs?

<p>{(7, 4), (8, 4), (9, 4), (9, 5)} (C)</p> Signup and view all the answers

What is the range of the function represented by the given temperature vs. time graph?

<p>All real numbers between and including 50 and 212. (D)</p> Signup and view all the answers

Based on the graph modeling price markup, which option correctly describes the function's domain?

<p>Numbers between and including 0 and 36. (C)</p> Signup and view all the answers

What is the total bill a homeowner must pay for using 3800 gallons of water, considering both water and sewer fees?

<p>$33.25 (A)</p> Signup and view all the answers

What is the weight of a baby at age 5 months according to the function f(x) = 1.5x + 7?

<p>13.5 pounds (D)</p> Signup and view all the answers

What is the value of the function f(x) = 5(x + 1) + 2x at x = 3?

<p>16 (B)</p> Signup and view all the answers

Which of the following pairs represents a function based on the given criteria?

<p>{(0, 1), (1, 2), (2, 3), (3, 4)} (D)</p> Signup and view all the answers

What is the correct domain for the profit function P(t) of the math club selling T-shirts, where each T-shirt sold represents a profit of $2?

<p>0 ≤ t ≤ 500 (B)</p> Signup and view all the answers

In the context of the lava flow modeled by the function f(d) = 800d, what is the best description of the domain?

<p>All non-negative integers. (C)</p> Signup and view all the answers

What does an average change in distance of zero imply about Victoria's movements between 10:00 a.m. and 11:00 a.m.?

<p>Victoria could have stayed at the same location from 10:00 a.m. to 11:00 a.m. (C)</p> Signup and view all the answers

How is the average rate of change for the function f(x) calculated over the interval [1, 8] given specific values?

<p>(f(8) - f(1)) / (8 - 1) (C)</p> Signup and view all the answers

When calculating the average rate of change in miles per gallon from 180 miles to 480 miles, which values are used in the expression?

<p>480 - 180 / 300 (D)</p> Signup and view all the answers

Which of the following statements about the distance and time table for Victoria is accurate?

<p>Victoria's distance returned to 0 miles indicates she returned home. (D)</p> Signup and view all the answers

What does the slope of the line represented in the graph from (0,0) to (5,5) signify?

<p>The relationship is linear with a slope of 1. (A)</p> Signup and view all the answers

Which range of values can correctly be described as the domain of the function P(t), where t represents the number of T-shirts sold?

<p>t must be between 0 and 500, inclusive. (C)</p> Signup and view all the answers

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Study Notes

Solving Equations and Inequalities

  • Question 1: The value of x in the equation -(1 - x) = -2(3x - 1) is 1/7.
  • Question 2: If -5x + 7 = 2x - 3, then x = 10/7.
  • Question 3: The solution for n in the inequality -17 + 3n ≤ 7(n - 2) is n ≥ 15/4*.
  • Question 4: The point (1/2, 0) is on the graph of 2x -16y = 8.

Trapezoids and Formulas

  • Question 5: The formula A = 1/2 (b₁ + b₂)h can be used to determine the area of a trapezoid. Solving for b₁ will result in the equation b₁ = 2A/h - b₂.
  • Question 6: The equation P = 2n - 800 can be rearranged to solve for n as a function of P resulting in the following: n = 1/2 (P + 800)
  • Question 7: The formula C = (5n + 40)/9 can be rearranged to solve for the number of chirps as a function of the temperature in degrees Celsius. The correctly rearranged formula is n = 9/5 (C - 40)*.

Inequalities and Systems of Equations

  • Question 8: The inequality 17b + 25p ≤ 75 could be used to determine b, the number of blouses, and p, the number of pants Grace can afford.
  • Question 9: The system of equations x + y = 90* and 2x - y = 15 could be used to solve for x and y.

Word Problems

  • Question 10: A possible way Harry might buy the hamburgers and hot dogs is 66 hamburgers and 33 hot dogs.
  • Question 11: The set of ordered pairs {(-4, 4), (-2, 4), (1, 4), (5, 4)} represents a function.

Functions

  • Question 12: The range of the function shown in the graph is All real numbers between and including 50 and 212.
  • Question 13: Based on the given graph, the function's domain is Numbers between and including 0 and 30.
  • Question 14: The total amount a homeowner will pay if the water and sewer usage for one month is 3800 gallons is $43.35.
  • Question 15: According to the model f(x) = 1.5x + 7, the weight of a baby at age 5 months is 14.5 pounds.
  • Question 16: Given f(x) = 5(x + 1) + 2x, f(3) is 26.
  • Question 17: The domain of the function shown in the graph is All real numbers between 0 and 6.
  • Question 18: A reasonable domain of the function P(t) is 0 ≤ t ≤ 500.
  • Question 19: The domain of f(d) in the context of the lava flow is best described as All non-negative integers.
  • Question 20: The best interpretation of Victoria's average change in distance during this time is Victoria could have stayed at the same location from 10:00 a.m. to 11:00 a.m..

Rate of Change

  • Question 21: The average rate of change for the function f(x) over the interval [1, 8] is 4.
  • Question 22: The average rate of change, in miles per gallon, from 180 miles to 480 miles is 480 - 180 / 300.

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